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Nope, I think you'll find a bung on the bottom of the can, take it out, cover the end of the can with a rag, rev the bike a few times.
Failing that push some packing into the can with broom handle a...

Most aftermarket pipes are designed to add power, intern they make a heap more noise than a standard pipe/ can.
The TRX is a very common bike you shouldn't have to much drama getting a second hand...